Aironet PCI4810B Guide de l'utilisateur télécharger pdf (Page 61)

Appendix A: Aironet Wireless LAN Adapter Overview

• Antenna Type and Placement. Proper antenna con-

figuration is a critical factor in maximizing radio range.

As a general guide, range increases in proportion to

antenna height.

For a detailed explanation of antenna types and config-

urations along with guidelines on selecting antennas for

specific environments, see the Aironet Antenna Guide.

• Physical Environments. Clear or open areas provide

better radio range than closed or filled areas. Also, the

less cluttered the work environment, the greater the

range.

• Obstructions. A physical obstruction such as metal

shelving or a steel pillar can hinder the performance of

the PCI/ISA Card. Avoid locating the computing device

in a location where there is a metal barrier between the

sending and receiving antennas.

• Building Materials. Radio penetration is greatly influ-

enced by the building material used in construction. For

example, drywall construction allows greater range

than concrete blocks. Metal or steel construction is a

barrier to radio signals.

Link Test

The link test tool is used to determine RF coverage.

The test results help the installer eliminate low RF sig-

nal level area that can result in loss of connection.

Radio Antenna

Optional antennas are offered for the PCI/ISA Card. Con-

sult the Aironet Antenna Guide for more information.

Security Features

The Aironet 4800B Series PCI/ISA Wireless LAN Adapter

employs Direct Sequence Spread Spectrum Technology,

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Aironet PCI4810B Guide de l'utilisateur Page 61